For solo trips during moderate to warmer seasons I use a AGG 3-cup pot, fancy feast alcohol stove (popularized by andrew skurka), and foil windscreen.

For solo trips during winter or colder seasons, where the ability to potentially boil water fast and in larger more frequent quantities is nice, I'm leaning toward a jetboil sol. I've really loved my msr reactor for groups of two or three but its a bit heavy and bulky for winter solo trips (of which I'm doing more of).